Afternoon tea is more than a large mug
Afternoon tea is a food-and-tea occasion whose details depend on the venue. Read the menu before imagining a fixed ritual.

Read it as a menu, not just a drink
An afternoon tea booking usually means a selection of savoury and sweet food served with tea, rather than simply ordering a mug in the afternoon. Sandwiches, scones, and small cakes are familiar elements, but individual venues vary the format. Read the actual menu, portion arrangement, and booking terms. A traditional-looking tiered stand does not tell you whether the tea is included, whether refills are offered, or how dietary requests are handled.
Think about the occasion you want. A formal hotel service, a small tearoom, and a contemporary café can all use the name while offering different atmospheres. There is no need to choose the grandest setting to experience something worthwhile. Look for a pace and level of formality you will enjoy. Check current dress guidance directly where relevant, rather than treating an old etiquette article as a reliable description of every place you might visit.
Give the tea some attention too
The food can dominate the photograph, but the tea is worth choosing deliberately. Ask what the menu descriptions mean if several unfamiliar names appear. A familiar plain tea may be a better companion for the whole selection than an intensely flavoured choice that clashes with everything sweet. If you want milk, say so when asking for advice. You do not have to choose the most expensive or unusual tea to take the occasion seriously.
Mention allergies or other essential dietary requirements before booking and confirm what the venue can actually provide. A general vegetarian or plant-based option does not answer every ingredient question. Do not assume that removing one item from a stand resolves a specific restriction. Equally, let the staff explain the service rather than rearranging shared food before everybody understands what belongs to whom. Ordinary consideration is more useful than memorised rules about the angle of a cup handle.
Leave room to enjoy it
Allow time, avoid scheduling a large meal immediately beforehand, and ask how long the table is available if that matters. There is no obligation to turn the experience into a performance of perfect British manners. The pleasure lies in conversation, a sequence of small things to eat, and tea that suits them. A good visit can remain relaxed even when the porcelain is elaborate.